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SCANDEPS(1p)						User Contributed Perl Documentation					      SCANDEPS(1p)

NAME
scandeps - Scan file prerequisites SYNOPSIS
% scandeps *.pm # Print PREREQ_PM section for *.pm % scandeps -e 'STRING' # Scan an one-liner % scandeps -B *.pm # Include core modules % scandeps -V *.pm # Show autoload/shared/data files % scandeps -R *.pm # Don't recurse % scandeps -C CACHEFILE # use CACHEFILE to cache dependencies DESCRIPTION
scandeps is a simple-minded utility that prints out the "PREREQ_PM" section needed by modules. If you have CPANPLUS installed, modules that are part of an earlier module's distribution with be denoted with "S"; modules without a distribution name on CPAN are marked with "?". Also, if the "-B" option is specified, module belongs to a perl distribution on CPAN (and thus uninstallable by "CPAN.pm" or "CPANPLUS.pm") are marked with "C". Finally, modules that has loadable shared object files (usually needing a compiler to install) are marked with "X"; with the "-V" flag, those files (and all other files found) will be listed before the main output. Additionally, all module files that the scanned code depends on but were not found (and thus not scanned recursively) are listed. These may include genuinely missing modules or false positives. That means, modules your code does not depend on (on this particular platform) but that were picked up by the heuristic anyway. OPTIONS
-e STRING Scan STRING as a string containing perl code. -c Compiles the code and inspects its %INC, in addition to static scanning. -x Executes the code and inspects its %INC, in addition to static scanning. -B Include core modules in the output and the recursive search list. -R Only show dependencies found in the files listed and do not recurse. -V Verbose mode: Output all files found during the process; show dependencies between modules and availability. Additionally, warns of any missing dependencies. If you find missing dependencies that aren't really dependencies, you have probably found false positives. -C CACHEFILE Use CACHEFILE to speed up the scanning process by caching dependencies. Creates CACHEFILE if it does not exist yet. SEE ALSO
Module::ScanDeps, CPANPLUS::Backend, PAR ACKNOWLEDGMENTS
Simon Cozens, for suggesting this script to be written. AUTHORS
Audrey Tang <autrijus@autrijus.org> COPYRIGHT
Copyright 2003, 2004, 2005, 2006 by Audrey Tang <autrijus@autrijus.org>. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See <http://www.perl.com/perl/misc/Artistic.html> perl v5.14.2 2012-02-24 SCANDEPS(1p)

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Module::ScanDeps(3)					User Contributed Perl Documentation				       Module::ScanDeps(3)

NAME
Module::ScanDeps - Recursively scan Perl code for dependencies SYNOPSIS
Via the command-line program scandeps.pl: % scandeps.pl *.pm # Print PREREQ_PM section for *.pm % scandeps.pl -e "use utf8" # Read script from command line % scandeps.pl -B *.pm # Include core modules % scandeps.pl -V *.pm # Show autoload/shared/data files Used in a program; use Module::ScanDeps; # standard usage my $hash_ref = scan_deps( files => [ 'a.pl', 'b.pl' ], recurse => 1, ); # shorthand; assume recurse == 1 my $hash_ref = scan_deps( 'a.pl', 'b.pl' ); # App::Packer::Frontend compatible interface # see App::Packer::Frontend for the structure returned by get_files my $scan = Module::ScanDeps->new; $scan->set_file( 'a.pl' ); $scan->set_options( add_modules => [ 'Test::More' ] ); $scan->calculate_info; my $files = $scan->get_files; DESCRIPTION
This module scans potential modules used by perl programs, and returns a hash reference; its keys are the module names as appears in %INC (e.g. "Test/More.pm"); the values are hash references with this structure: { file => '/usr/local/lib/perl5/5.8.0/Test/More.pm', key => 'Test/More.pm', type => 'module', # or 'autoload', 'data', 'shared' used_by => [ 'Test/Simple.pm', ... ], uses => [ 'Test/Other.pm', ... ], } One function, "scan_deps", is exported by default. Other functions such as ("scan_line", "scan_chunk", "add_deps", "path_to_inc_name") are exported upon request. Users of App::Packer may also use this module as the dependency-checking frontend, by tweaking their p2e.pl like below: use Module::ScanDeps; ... my $packer = App::Packer->new( frontend => 'Module::ScanDeps' ); ... Please see App::Packer::Frontend for detailed explanation on the structure returned by "get_files". scan_deps $rv_ref = scan_deps( files => @files, recurse => $recurse, rv => \%rv, skip => \%skip, compile => $compile, execute => $execute, ); $rv_ref = scan_deps(@files); # shorthand, with recurse => 1 This function scans each file in @files, registering their dependencies into %rv, and returns a reference to the updated %rv. The meaning of keys and values are explained above. If $recurse is true, "scan_deps" will call itself recursively, to perform a breadth-first search on text files (as defined by the -T operator) found in %rv. If the "\%skip" is specified, files that exists as its keys are skipped. This is used internally to avoid infinite recursion. If $compile or $execute is true, runs "files" in either compile-only or normal mode, then inspects their %INC after termination to determine additional runtime dependencies. If $execute is an array reference, runs the files contained in it instead of @files. If performance of the scanning process is a concern, "cache_file" can be set to a filename. The scanning results will be cached and written to the file. This will speed up the scanning process on subsequent runs. Additionally, an option "warn_missing" is recognized. If set to true, "scan_deps" issues a warning to STDERR for every module file that the scanned code depends but that wasn't found. Please note that this may also report numerous false positives. That is why by default, the heuristic silently drops all dependencies it cannot find. scan_deps_runtime Like scan_deps, but skips the static scanning part. scan_line @modules = scan_line($line); Splits a line into chunks (currently with the semicolon characters), and return the union of "scan_chunk" calls of them. If the line is "__END__" or "__DATA__", a single "__END__" element is returned to signify the end of the program. Similarly, it returns a single "__POD__" if the line matches "/^=w/"; the caller is responsible for skipping appropriate number of lines until "=cut", before calling "scan_line" again. scan_chunk $module = scan_chunk($chunk); @modules = scan_chunk($chunk); Apply various heuristics to $chunk to find and return the module name(s) it contains. In scalar context, returns only the first module or "undef". add_deps $rv_ref = add_deps( rv => \%rv, modules => @modules ); $rv_ref = add_deps( @modules ); # shorthand, without rv Resolves a list of module names to its actual on-disk location, by finding in @INC and @Module::ScanDeps::IncludeLibs; modules that cannot be found are skipped. This function populates the %rv hash with module/filename pairs, and returns a reference to it. path_to_inc_name $perl_name = path_to_inc_name($path, $warn) Assumes $path refers to a perl file and does it's best to return the name as it would appear in %INC. Returns undef if no match was found and a prints a warning to STDERR if $warn is true. E.g. if $path = perl/site/lib/Module/ScanDeps.pm then $perl_name will be Module/ScanDeps.pm. NOTES
@Module::ScanDeps::IncludeLibs You can set this global variable to specify additional directories in which to search modules without modifying @INC itself. $Module::ScanDeps::ScanFileRE You can set this global variable to specify a regular expression to identify what files to scan. By default it includes all files of the following types: .pm, .pl, .t and .al. Additionally, all files without a suffix are considered. For instance, if you want to scan all files then use the following: "$Module::ScanDeps::ScanFileRE = qr/./" CAVEATS
This module intentially ignores the BSDPAN hack on FreeBSD -- the additional directory is removed from @INC altogether. The static-scanning heuristic is not likely to be 100% accurate, especially on modules that dynamically load other modules. Chunks that span multiple lines are not handled correctly. For example, this one works: use base 'Foo::Bar'; But this one does not: use base 'Foo::Bar'; SEE ALSO
scandeps.pl is a bundled utility that writes "PREREQ_PM" section for a number of files. An application of Module::ScanDeps is to generate executables from scripts that contains prerequisite modules; this module supports two such projects, PAR and App::Packer. Please see their respective documentations on CPAN for further information. AUTHORS
Audrey Tang <cpan@audreyt.org> To a lesser degree: Steffen Mueller <smueller@cpan.org> Parts of heuristics were deduced from: o PerlApp by ActiveState Tools Corp <http://www.activestate.com/> o Perl2Exe by IndigoStar, Inc <http://www.indigostar.com/> The scan_deps_runtime function is contributed by Edward S. Peschko. <http://par.perl.org/> is the official website for this module. You can write to the mailing list at <par@perl.org>, or send an empty mail to <par-subscribe@perl.org> to participate in the discussion. Please submit bug reports to <bug-Module-ScanDeps@rt.cpan.org>. COPYRIGHT
Copyright 2002-2008 by Audrey Tang <cpan@audreyt.org>; 2005-2010 by Steffen Mueller <smueller@cpan.org>. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See <http://www.perl.com/perl/misc/Artistic.html> perl v5.16.2 2012-10-19 Module::ScanDeps(3)
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